The study relevant to men is linked to the use of vitamin E supplements, which were shown to increase the risk of prostate cancer by 17%. The test subjects in the study were assigned to take a 400-unit capsule of vitamin E for about five years and compared to those who took placebos, they had a much higher risk of developing prostate cancer.

The scary part is that a 400-unit capsule is just the regular, over-the-counter pill size, but the recommended daily amount for an adult is a 23-unit serving.